Kenneth J. Chang, M.D., M.A.S.G.E., A.G.A.F., F.A.C.G., F.J.G.E.S., F.A.F.S is the Executive Medical Director of the Digestive Health Institute at Hoag. He leads Orange County’s largest digestive health programs and services in expanding the delivery of world-class care. Dr. Chang is a world-renown researcher, inventor, advanced endoscopist and pioneer in the field of interventional endoscopy and endoscopic oncology. He is a board-certified gastroenterologist, who is fellowship trained in gastroenterology and hepatology, and specializes in Interventional Endoscopy, Endoscopic Oncology, Endo-Hepatology, Endo-Bariatrics, and Endoscopic Treatment for GERD and motility disorders.